US8116811B2 - Wireless communication control apparatus and method for mobile objects - Google Patents

Wireless communication control apparatus and method for mobile objects Download PDF

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US8116811B2
US8116811B2 US12/388,073 US38807309A US8116811B2 US 8116811 B2 US8116811 B2 US 8116811B2 US 38807309 A US38807309 A US 38807309A US 8116811 B2 US8116811 B2 US 8116811B2
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communication
wireless communication
mobile object
wireless
state information
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US20090209282A1 (en
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Yuichi Kobayashi
Masamori Kashiyama
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Hitachi Ltd
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Hitachi Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination

Definitions

  • the present invention relates to a wireless communication technology for a mobile object, and more particularly to a wireless communication control apparatus, and a wireless communication control method, for a mobile object whose position can be detected.
  • a mobile communication terminal has a wireless communication function of connecting to a network (wireless communication network) such as a mobile telephone network, and carries out data communications.
  • a network wireless communication network
  • the wireless communication network does not cover the whole range within which a mobile object moves, the communication speed may decrease, or a communication link may be disconnected, while the mobile object is moving. Therefore, it is difficult to always achieve the excellent communication quality.
  • the efficiency in communication is improved by identifying an obstacle on the basis of information obtained from an in-vehicle camera to estimate the temporal transition of a communication environment, and by changing values of communication parameters including the data transmission speed, and the packet length in response to a change in communication environment.
  • the influence exerted on the communication environment is not limited to obstacles. Because there are various causes of the change in communication environment, it was difficult for the conventional mobile communication terminals to correctly estimate a communication environment.
  • the wireless communication apparatus and method include the steps of: collecting communication-state information corresponding to positional information of the mobile object for each of a plurality of communication methods that are used to make a connection to a wireless communication device of the mobile object, and that can be selectively set in the wireless communication device; referring to the communication-state information corresponding to the positional information indicating a current position of the mobile object, and selecting one communication method from among the plurality of communication methods that can be selectively set in the wireless communication device; and setting, in the wireless communication device, control information used for communications based on the selected communication method.
  • a judgment is made as to whether or not at least one of ratios satisfies a specified condition (for example, a condition in which at least one of ratios is larger than or equal to a specified threshold value, or a condition in which at least one of ratios is the highest, or the lowest, among ratios based on the plurality of communication methods), and then one of the communication methods is selected on the basis of the result of the judgment.
  • a specified condition for example, a condition in which at least one of ratios is larger than or equal to a specified threshold value, or a condition in which at least one of ratios is the highest, or the lowest, among ratios based on the plurality of communication methods
  • the ratios are a ratio of the communicable time during which communications can be performed by a corresponding communication method in an estimated move path to the moving time during which the mobile object is moving in the estimated move path from a first position (for example, a current position) to a second position (for example, a destination) (for example, a move path estimated by a navigation system), and a ratio of the communicable distance within which communications can be performed by the corresponding communication method in the estimated move path to the moving distance between which the mobile object moves in the estimated move path from the first position to the second position of the mobile object.
  • the plurality of communication methods which can be selectively set in the wireless communication device are a plurality of communication speeds.
  • the communication-state information indicates that communications based on the communication speed set in the wireless communication device has resulted in either success or failure.
  • the positional information is a mesh code that indicates a range including a position of the mobile object.
  • the communication method is selected according to a policy for the selection of a communication method, the policy being set by a user.
  • a communication method corresponding to a current position of the mobile object is selected by use of actually measured data of a communication state corresponding to a position of the mobile object. This makes it possible to ensure a quick and proper response to a change in wireless communication environment.
  • FIG. 1 is a diagram illustrating a configuration of a mobile object wireless communication system
  • FIG. 2 is a diagram illustrating an example of communication state map data
  • FIG. 3 is a diagram illustrating an example of communication-state estimation data
  • FIG. 4 is a diagram illustrating an example of a policy setting screen
  • FIG. 5 is a flowchart illustrating a communication state map creating unit
  • FIG. 6 is a flowchart illustrating a communication control unit
  • FIG. 7 is a flowchart illustrating processing of a communication method setting unit.
  • FIG. 8 illustrates equations used to determine a ratio of the time during which it is expected that communications can be performed to a period of time during which a mobile object moves from a current position to a destination.
  • the embodiment of the invention is designed to create a communication state map (collect communication state data) with the use of communication state data measured by a position detector and a wireless communication device both mounted on a mobile object and then to control the wireless communication method of the mobile object based on the communication state map (the collected communication state data).
  • FIG. 1 illustrates the configuration of the wireless communication system of a mobile object.
  • the wireless communication system includes a mobile object 10 capable of communicating while moving; a positional information transmitter 20 for externally transmitting information to the mobile object 10 for the mobile object 10 to detect its own position; and base stations 31 and 32 to which the mobile object 10 connects for wireless communication.
  • the base stations 31 and 32 are connected via a network to a communication state map server 40 and a server 50 .
  • the mobile object 10 can be a car navigation system, a personal navigation device (PND), or a mobile phone, for example. It can also be a vehicle having such wireless communication devices.
  • the positional information transmitter 20 can be one of those provided near the sidewalks of a road, a satellite for a global positioning system (GPS), or an optical beacon.
  • the base stations 31 and 32 also called access points, can be different in kind; for example, one could be a station for mobile phones or PHS (personal handy-phone system) terminals, and the other for a wireless LAN.
  • the communication state map server 40 can be a sever offered by telematics services (the telematics services refer to the integrated services of telecommunications and information services and specifically in Japan to those of the Internet and wireless in-vehicle communication technologies).
  • the communication state map server 40 can also be included in a common ASP (application service provider) server as part of its functions.
  • the server 50 can be a traffic information distribution server, map information distribution server, telematics server, or common ASP server. Because the communication state map server 40 can be the same as the server 50 in physical configuration, the communication state map server 40 may also be referred to simply as a server.
  • the mobile object 10 is assumed to be a vehicle that has such a wireless communication device as mentioned above and connects in a wireless manner to the communication state map server 40 for wireless communication.
  • the mobile object 10 includes a position detector 120 , wireless communication devices 131 and 132 , a storage device 140 , and a central processing unit (CPU) 110 .
  • the position detector 120 is such a device as detects the position of the mobile object 10 with the use of a signal from the positional information transmitter 20 (such as a GPS or an optical beacon).
  • the position detector 120 can be an autonomous navigation device such as a vehicle speed pulse detector and a gyroscope.
  • the wireless communication devices 131 and 132 are different in kind; for example, one could be a mobile phone or a PHS terminal, and the other a wireless LAN.
  • the storage device 140 is a hard disk drive or a flash memory for storing communication state map data 141 .
  • the CPU 110 is connected to the position detector 120 , the wireless communication devices 131 and 132 , the storage device 140 and other devices not shown; it creates the communication state map data 141 and controls the communication of the mobile object 10 .
  • the configuration including the position detector 120 , the wireless communication devices 131 and 132 , the storage device 140 and the CPU 110 is called a wireless communication control apparatus, and so is the configuration including the storage device 140 and the CPU 110 but excluding the position detector 120 and the wireless communication devices 131 and 132 .
  • the CPU 110 includes a communication state map creating unit (communication states collecting unit) 112 ; a communication control unit 111 ; and a communication method setting unit 113 .
  • the communication state map creating unit 112 creates the communication state map data 141 indicating communication states of the mobile object 10 at respective geographical locations on the basis of the positional information of the mobile object 10 acquired from the position detector 120 and one or more of the communication states acquired from either or both of the wireless communication devices 131 and 132 and then stores the communication state map data 141 on the storage device 140 .
  • the communication control unit 111 selects a communication method for the wireless communication device 131 or 132 or both based on the communication state map data 141 stored on the storage device 140 or based on the communication state map data 441 accumulated in the communication state map server 40 .
  • the communication method setting unit 113 sets the communication method selected by the communication control unit 111 for the wireless communication device 131 or 132 or both.
  • the communication state map server 40 includes a communication device 430 for connection to the network; a storage device 440 such as a hard disk drive for accumulating the communication state map data 441 ; and a central processing unit (CPU) 410 connected to the communication device 430 and the storage device 440 to manage the communication state map data 441 .
  • a communication device 430 for connection to the network
  • a storage device 440 such as a hard disk drive for accumulating the communication state map data 441
  • CPU central processing unit
  • the communication state map data 141 , the communication state map creating unit (communication state collecting unit) 112 , and the communication state map server 40 each include the word “map” in their names because a map is to be displayed on a display unit of the mobile object 10 . In this embodiment, those can also be called without the word “map,” as in “the communication state data 141 ,” “the communication state collecting unit 112 , and “the communication state managing server 40 .”
  • wireless communication devices and base stations for those also differ.
  • the communication methods of mobile phones range from W-CDMA, CDMA2000, to GSM (Global System for Mobile communications); thus, wireless communication devices and base stations for the mobile phones also differ.
  • a communication method used by the wireless communication device A 131 and the base station A 31 differs from that used by the wireless communication device 132 and the base station B 32 .
  • Each of the base station A and the base station B includes multiple base stations so that multiple areas are covered.
  • the wireless communication device is a mobile phone or a PHS terminal
  • the wireless communication device can be built in the mobile object 10 or externally connected to the mobile object 10 . If the wireless communication device is externally connected to the mobile object 10 , it is desirable that the mobile object 10 include an interface for connection to the wireless communication device.
  • FIG. 2 is a table illustrating an example of the communication state map data 141 .
  • the communication state map data 141 includes the columns of: the row number 1410 of a data row; the vehicle ID 1411 for identifying a mobile object 10 ; the time 1412 at which the data was recorded; the communication state of the wireless communication method A 131 (the communication speed 1413 measured by the wireless communication device A 131 ); the communication state of the wireless communication method B 132 (the communication speed 1414 measured by the wireless communication device B 132 ); the latitude 1415 measured by the position detector 120 ; the longitude 1416 measured by the position detector 120 ; the mesh code 1417 indicating an area defined by the latitude 1415 and the longitude 1416 (for example, a grid square code defined by JISX0410); and the transmission state 1418 indicating whether or not the data has been transmitted to the communication state map server 40 .
  • the mesh code may be of a third regional block (1 km ⁇ 1 km). However, it is more desirable that the mesh code be of a block whose
  • Exclusion of the transmission state 1418 from the fields of each row constituting the communication state map data 141 shown in FIG. 2 produces fields of each row constituting the communication state map data 441 that is stored in the storage unit 440 of the communication state map server 40 .
  • FIG. 3 is a diagram illustrating an example of communication-state estimation data 142 that is acquired by collecting a communication state of a wireless communication device at a point at which the mobile object 10 is expected to travel on the basis of movement estimation information of the mobile object 10 .
  • the communication-state estimation data 142 is constituted of rows, each of which includes fields of: a row number 1420 indicating a row number of each row constituting the data; a vehicle ID 1421 for identifying the mobile object 10 ; the estimated time 1422 at which a wireless communication method will be changed; an estimated mesh code 1423 indicating a range within which the mobile object 10 is expected to travel at the estimated time 1422 ; a communication state of the wireless communication method A corresponding to the estimated mesh code 1423 (communication speed 1424 of the wireless communication device 131 ); a communication state of the wireless communication method B corresponding to the estimated mesh code 1423 (communication speed 1425 of the wireless communication device 132 ); a wireless communication method 1426 that complies with a policy which lays stress on the reduction of
  • a communication fee differs depending on, for example, a wireless communication service provider who provides wireless communications. Each wireless communication service provider determines a fee per unit communication data amount and a fee per unit time. To be more specific, the communication fee differs depending on the classification of a base station (the classification of a communication method). In this embodiment, the communication fee differs depending on which connection is made: more specifically, making a connection to the base station A 31 by use of the wireless communication device A 131 , or making a connection to the base station B 32 by use of the wireless communication device B 132 .
  • the stability of connections differs depending on, for example, a communicable range covered by a base station (if the number of base stations is two or more, the communicable range is covered by the plurality of base stations), and a congestion degree of communications.
  • a connection can be made within the communicable range.
  • a connection cannot be made outside the communicable range.
  • an actually measured value indicating whether or not a connection can be made is measured at each position. Accordingly, a communicable range can be substantially correctly kept track of. If communications are extremely congested, the communication speed decreases. Further, there is also a possibility that a connection cannot be made.
  • the stability of communication differs depending on the classification of a base station (the classification of a communication method), and depending on a communication state of the base station.
  • the communication speed differs depending on, for example, the nominal speed and a congestion degree of communication. If the nominal speed is low, the communication speed is also low. However, even if the nominal speed is high, congested communication causes the communication speed to decrease.
  • the communication speed also differs depending on the classification of a base station (the classification of a communication method), and depending on a communication state of the base station.
  • FIG. 4 is a diagram illustrating an example of a policy setting screen 1110 intended for users, the policy setting screen 1110 allowing a user who operates the mobile object 10 to set a policy of selecting a communication method. It is assumed that policies which can be set by the user are fee priority, connection priority, and communication speed priority.
  • the policy setting screen 1110 displays the following: a “Communication method automatic selection mode” button 1111 that allows the user to select whether or not the communication control unit 111 automatically changes a wireless communication method; a “Fee priority” button 1112 that allows the user to select a communication method when the user lays stress on a lower communication fee; a “Connection priority” button 1113 that allows the user to select a communication method when the user lays stress on the stability of the connection of a communication link; and a “Communication speed priority” button 1114 that allows the user to select a communication method when the user lays stress on the communication speed.
  • These policies are made use of when the communication control unit 111 selects a communication method. In the example shown in FIG.
  • FIG. 8 illustrates equations for determining, on a wireless communication method basis, a ratio of the time during which it is expected that communications can be performed to a period of time during which a mobile object moves from a current position to a destination on the basis of the communication-state estimation data 142 shown in FIG. 3 .
  • R is a rate of the communicable time during which it is expected that communications can be performed while the mobile object moves from the current position to the destination.
  • i is a row number (the row number 1420 ) of a row having the same value of the vehicle ID 1421 ;
  • s is a row number of a row corresponding to the current position;
  • g is a row number of a row corresponding to the destination.
  • ti is the estimated time (the estimated time 1422 ) when a row number is i.
  • Vi is the communication speed (the communication speed 1424 or the communication speed 1425 ) when a row number is i.
  • a pulse function f is a function of the row number i. If the communication speed is not 0, a value of the pulse function f is 1. If the communication speed is 0, a value of the pulse function f is 0.
  • the communicable time rate R is a ratio of the time during which the mobile object moves through an area in which the communication speed is not equivalent to 0 (in other words, an area in which a connection can be made by a wireless communication method) to the moving time during which the mobile object moves along a move path from the current position to the destination.
  • the communicable time rate R may also be determined by dividing the number of mesh codes from the current position to the destination in which the communication speed is not equivalent to 0 (in other words, the number of communicable mesh codes) by the total number of mesh codes ranging from the current position to the destination on a wireless communication method basis.
  • the communicable time rate R is a ratio of the distance between which the mobile object moves through an area in which the communication speed is not equivalent to 0 (in other words, an area in which a connection can be made by a wireless communication method) to the moving distance from the current position to the destination along the move path.
  • FIG. 5 is a flowchart illustrating processing of the central processing unit (CPU) 110 included in the mobile object 10 (the communication state map creating unit 112 ).
  • the communication state map creating unit 112 periodically starts processing by starting a periodical timer.
  • Regular communication processing is processing other than the processing performed by the communication state map creating unit 112 .
  • the regular communication processing mainly includes application processing of receive telematics services. Viewing from the communication state map creating unit 112 , the undermentioned processing performed by the communication method setting unit 113 also seems to be regular communication processing.
  • the communication state map creating unit 112 checks whether or not a wireless communication device can be used (S 500 ). If it is judged that the wireless communication device cannot be used, the processing ends. Because the wireless communication device is used for regular communication processing, the communication state map creating unit 112 is forced to share the same wireless communication device. The wireless communication, therefore, must be exclusively controlled. For this reason, a check is made as to whether or not a wireless communication device can be used; and if it is judged that the wireless communication device cannot be used (more specifically, if it is judged that the wireless communication device is being used for regular communication processing, or that the regular communication processing is waiting for permission to use the wireless communication device), the processing ends.
  • a flag is switched ON at the start of regular communication processing; and the flag is then switched OFF at the end of the regular communication processing.
  • the flag is in an OFF state
  • processing of the communication state map creating unit 112 can be executed.
  • the communication state map creating unit 112 starts the processing thereof.
  • the regular communication processing switches OFF the flag, before the regular communication processing ends.
  • the execution of the regular communication processing is forced to be in a waiting state. In order to avoid such a situation, there is provided a flag indicating that the regular communication processing is waiting for use. If the use-waiting flag is in an ON state, the use by the communication state map creating unit 112 is disallowed.
  • the communication state map creating unit 112 can execute the processing thereof by use of a wireless communication device that is not being used by the regular communication processing. In this case, whether or not a wireless communication device can be used may also be checked on the basis of the selection of a communication method.
  • a processing flag is provided, and it is switched ON (S 505 ). If the processing flag is ON, the regular communication processing is disallowed to use the wireless communication device.
  • various kinds of parameters of a communication method (used for the regular communication processing), which are set in a wireless communication device, are saved (S 510 ). These parameters are saved for the purpose of restoring the communication method set in the wireless communication device when the communication state map creating unit 112 ends the processing thereof.
  • the various kinds of parameters differ depending on a wireless communication device, most of them are set in a control register of the wireless communication device. Because data stored in the control register is often copied to a storage unit, the copied data has only to be stored in a save area of the storage unit.
  • the time is measured, and the measured time data is then stored in a “time” field 1412 of the communication state map data 141 .
  • An identifier of the mobile object 10 is stored in a “vehicle ID” field 1411 ; and “uncompleted” is stored in a “transmission state” field 1418 (S 515 ).
  • the description below is based on the assumption that the communication speed based on each of two or more kinds of communication methods is measured at the same time of day, and at the same position (in actuality, because the measurement result is influenced by the length of time taken by the measurement processing and the move of the mobile object, the communication speed is measured nearly at the same time of day, and nearly at the same position), and is then collected as data.
  • the communication speed is measured based on each of the plurality of communication methods, if there is a possibility that data cannot be regarded as data acquired at the same time of day, the data is compared with the latest “time” data 1412 stored in the communication state map data 141 shown in FIG. 2 so as to judge whether or not the measured time of day can be regarded as the latest time of day. If it is judged that the measured time of day cannot be regarded as the latest time of day, the measured time data is stored in the “time” field 1412 of a new row of the communication state map data 141 . If the time data has been stored, the row in which the time data has been stored becomes a row storing the latest time data. Other data is stored in the other fields of the row storing the latest time data.
  • null data or initial value data is stored if necessary.
  • Data of “uncompleted” is stored in the “transmission state” field 1418 . By handling data in this manner, the data is stored in a new row of the communication state map data 141 with the lapse of time.
  • Positional information is acquired by the position detector 120 , and the acquired data is then stored in a “latitude” field 1415 , a “longitude” field 1416 , and a “mesh code” field 1417 included in the communication state map data 141 (S 520 ). Because the correspondence between the acquired positional information and data to be stored is well known, the description thereof will be omitted. Incidentally, because the latitude and longitude are in correspondence with the mesh code, either of them may also be acquired.
  • the time data is not required.
  • the positional information and the undermentioned communication method are managed with both of them associated with each other.
  • the quality of wireless communications is influenced not only statically but also dynamically because of time factors including the daytime, the nighttime, and a season (fluctuations in position of a celestial body). Therefore, data is associated with time data here.
  • a communication method of the wireless communication device 131 or 132 disposed in the mobile object 10 is selected (S 525 ). If each of the two wireless communication devices 131 , 132 allows settings of one of two kinds of data transmission rates, and one of two kinds of modulation methods, the number of combinations of communication methods is eight. Therefore, selection is successively performed in each combination. It may also be so configured that a data transmission rate, a modulation method, and the like, can be set for one wireless communication device.
  • a data transmission rate of the wireless communication device 131 can be selected between 3 Mbps and 1 Mbps, whereas a data transmission rate of the wireless communication device 132 is fixed to 75 Mbps.
  • the number of selectable communication methods is three.
  • a communication method used by the wireless communication device 131 is shown as the communication A 1413
  • a communication method used by the wireless communication device 132 is shown as the communication B 1414 .
  • the table shown in FIGS. 2 and 3 may also be so configured that the number of communication methods used by the wireless communication device 131 is two or more (in this case, two) on the basis of a data transmission rate.
  • the table is configured on the basis of each different communication method.
  • the communication state map creating unit 112 measures the communication speed by use of the selected communication method (S 530 ).
  • the measurement of the communication speed described here means detection of whether or not communication by the selected communication method has been successfully performed.
  • test data in a specified format is prepared. It is so configured that the mobile object 10 transmits this test data to a base station at a data transmission rate of 1 Mbps by the wireless communication device 131 , and that the test data loops back from the base station, and then returns to the mobile object 10 .
  • the above configuration can be achieved by, for example, inserting information indicating the test data into a header portion of the test data in the specified format.
  • the communication speed is measured by transmitting test data, and by judging whether or not the looped back test data has been successfully received.
  • the wireless communication device 131 executes bit-error correction, and retransmission of the test data, at a lower protocol level (for example, a data link layer). As a result, the wireless communication device 131 notifies the CPU (the communication state map creating unit) of the success or failure in the receipt of the test data.
  • test data is repeatedly transmitted the specified number of times to determine a success probability from the number of times the test data has been successfully received. If the success probability is higher than or equal to a specified success probability, the receipt of the test data is judged to be successful.
  • successfully received test data is collated with the transmitted test data to determine a bit error rate. If the error correction and retransmission are not executed at a lower protocol level, this method is effective. However, in general, if the test data has been successfully received as a result of the execution of the error correction and retransmission, the received test data does not include an error bit. Therefore, this method is not effective.
  • the set data transmission rate (“1 Mbps”) is stored in the “communication A” field 1413 of the communication state map data 141 shown in FIG. 2 .
  • “0 Mbps” is stored in the “communication A” field 1413 .
  • “3 Mbps” can also be selected for the wireless communication device 131 as a data transmission rate. If the above-described conditions (at the same time of day, and at the same position) are satisfied, the “communication A” field 1413 of the communication state map data 141 is overwritten as a result of successful communication.
  • the communication state map data 141 in which “uncompleted” is stored in the “transmission state” field 1418 is transmitted to the communication state map server 40 . After that, “completed” is stored in the “transmission state” field 1418 (S 545 ).
  • the communication method used when the communication-state map data 141 is transmitted to the communication-state map server 40 is the communication method restored in the step S 540 .
  • the processing flag is switched OFF (S 550 ), before the process ends.
  • FIG. 6 is a flowchart illustrating processing of the central processing unit 110 included in the mobile object 10 (the communication control unit 111 ).
  • the communication control unit 111 starts processing periodically or in response to the occurrence of a communication error in the regular communication processing.
  • the communication control unit 111 may also be so controlled to start processing on the completion of the processing of the communication state map creating unit 112 .
  • the communication control unit 111 checks whether a current mode is a mode in which a communication method is automatically changed or a mode in which the communication method is manually changed (S 600 ). If it is judged that the current mode is the manual change mode, the process ends.
  • the communication control unit 111 acquires an estimated mesh code indicating an estimated traveling route (mesh code) of the mobile object 10 from a current position to a destination (S 605 ).
  • the destination can be acquired from a position (latitude, and longitude) of a destination that has been inputted into a car navigation system by a user, and that has been stored in the car navigation system.
  • the estimated traveling route is acquired from the result of a route search made in the car navigation system.
  • a judgment is made as to whether or not there is a new estimated traveling route (mesh code) for which a communication method has not been selected (S 610 ). If it is judged that there is no new estimated traveling route (mesh code), the process proceeds to a step S 650 .
  • the communication control unit 111 acquires the estimated time at which the mobile object 10 is expected to travel through (enter) an area corresponding to the acquired estimated mesh code (S 615 ). To be more specific, the communication control unit 111 acquires the estimated time on the basis of positional information, a traveling direction, and speed information received from the position detector 120 . The estimated time acquired here, and the mesh code paired therewith, correspond to the estimated time 1422 and the estimated mesh code 1423 included in the communication-state estimation data 142 shown in FIG. 3 respectively.
  • the communication control unit 111 searches the mesh code 1417 of the communication-state map data 141 for the estimated mesh code acquired in the step S 605 , and thereby acquires a communication state (the communication speed 1413 and 1414 ) corresponding to the estimated mesh code (S 620 ).
  • the acquired communication state (the communication speed 1413 and 1414 ) is stored as a communication state (the communication speed 1424 and 1425 ) in the communication-state estimation data 142 shown in FIG. 3 . If a plurality of mesh codes corresponding to the estimated mesh code have been found from the communication-state map data 141 , a communication state whose time is close to the estimated time acquired in the step S 615 is acquired. Moreover, if a plurality of mesh codes have been found at the time that is close to the estimated time acquired in the step S 615 , communication state data whose time is the newest is acquired.
  • the communication-state map server 40 is requested to transmit the communication-state map data (S 630 ).
  • this request is attached with an estimated mesh code, the estimated time acquired in the step S 615 , and information indicating a selectable communication method for the mobile object 10 .
  • the communication-state map server 40 searches the communication-state map data 441 for data corresponding to the request parameters attached to the request, and then transmits the data to the mobile object 10 .
  • the received data is added to the communication-state map data 141 . The process then returns to the step S 620 .
  • the communication-state map server 40 acquires the communication-state map data 141 from the plurality of moving bodies 10 (by the processing in the step S 545 shown in FIG. 5 ). Next, the communication-state map server 40 sorts the communication-state map data 141 by, for example, “mesh code” or “time” to store the sorted data in the storage unit 440 as the communication-state map data 441 . The communication-state map server 40 then executes processing according to a request as described in the step S 630 . A detailed description of the processing will be omitted.
  • the wireless communication method 1426 that complies with a policy which lays stress on fees
  • the wireless communication method 1427 that complies with a policy which lays stress on the connectivity
  • the wireless communication method 1428 that complies with a policy which lays stress on the communication speed are selected (S 635 ).
  • Reference values of communicable time rates (for example, 80%, 50%, 0%), and fee information for each wireless communication method, are stored in the storage unit 140 .
  • the reference values of the communicable time rates may also be set on a policy basis.
  • the communication control unit 111 executes processing including the steps of: calculating a communicable time rate on a wireless communication method basis by use of the equations shown in FIG. 8 ; on a wireless communication method basis, making a judgment as to whether or not the communicable time rate is higher than or equal to a reference value; extracting a wireless communication method whose communicable time rate is higher than or equal to the reference value; extracting fee information corresponding to the wireless communication method whose communicable time rate is higher than or equal to the reference value; comparing the pieces of fee information to select a wireless communication method whose fee is the lowest; and storing the selected wireless communication method in the “fee” fields 1426 corresponding to all estimated mesh codes ranging from a current position to a destination included in the communication-state estimation data 142 shown in FIG.
  • the communication control unit 111 judges that there is no wireless communication method whose communicable time rate is higher than or equal to the reference value, the communication control unit 111 stores a code “no wireless communication method” in the “fee” fields corresponding to all estimated mesh codes ranging from the current position to the destination included in the communication-state estimation data 142 shown in FIG. 3 .
  • the communication control unit 111 may also compare communicable time rates among the plurality of wireless communication methods to store a wireless communication method whose communicable time rate is high in the “fee” fields corresponding to all estimated mesh codes ranging from the current position to the destination included in the communication-state estimation data 142 shown in FIG. 3 , or the communication control unit 111 may also compare the communication speed among the plurality of wireless communication methods to store a wireless communication method whose communication speed is high in the “fee” fields corresponding to all estimated mesh codes ranging from the current position to the destination included in the communication-state estimation data 142 shown in FIG.
  • the same wireless communication method is assigned to all mesh codes ranging from the current position to the destination.
  • a wireless communication method may also be assigned to each mesh code by performing the above-described selection processing of a wireless communication method on a mesh code basis.
  • the communication control unit 111 executes processing including the steps of: on a mesh code basis, and on a wireless communication method basis, referring to the communication-state map data 141 shown in FIG. 2 to judge whether or not the communication speed is 0 Mbps (if the communication speed is 0 Mbps, the connection is not allowed; and if the communication speed is not 0 Mbps, the connection is allowed); extracting, on a mesh code basis, a wireless communication method whose communication speed is not 0 Mbps; and storing the wireless communication method whose communication speed is not 0 Mbps in the “connection” field 1427 included in the communication-state estimation data 142 shown in FIG. 3 on a mesh code basis.
  • the communication control unit 111 stores a code “no wireless communication method” in a corresponding “connection” field included in the communication-state estimation data 142 shown in FIG. 3 .
  • the connectivity means whether or not a connection can be made for a corresponding mesh code.
  • the communication control unit 111 may also store all of the plurality of wireless communication methods whose communication speed is not 0 Mbps in corresponding “connection” fields included in the communication-state estimation data 142 shown in FIG.
  • the communication control unit 111 may also compare the communication speed among the plurality of wireless communication methods whose communication speed is not 0 Mbps to select a wireless communication method whose communication speed is the lowest (the highest), so that the wireless communication method whose communication speed is the lowest (the highest) is stored in a corresponding “connection” field included in the communication-state estimation data 142 shown in FIG. 3 . For example, if a wireless communication method whose communication speed is the lowest is selected, because the communication speed of the communication A in the row number 1 of the communication-state estimation data 142 shown in FIG. 3 is low, “A” is stored in the “connection” field. In like manner, because the communication speed of the communication A in the row number 2 is low, “A” is stored in the “connection” field.
  • a communicable time rate may also be used.
  • the communication control unit 111 uses the equations shown in FIG. 8 to calculate a communicable time rate on a wireless communication method basis, and then stores a wireless communication method whose communicable time rate is the highest in the “connectivity” fields corresponding to all estimated mesh codes ranging from the current position to the destination included in the communication-state estimation data 142 shown in FIG. 3 .
  • the communication control unit 111 executes processing including the steps of: with reference to the communication-state map data 141 shown in FIG. 2 , comparing the communication speed on a mesh code basis, and selecting, on a mesh code basis, a wireless communication method whose communication speed is high; and storing the wireless communication method whose communication speed is not 0 Mbps in the “communication speed” field 1428 included in the communication-state estimation data 142 shown in FIG. 3 on a mesh code basis. For example, because the communication speed of the communication B is higher than that of the communication A in the row numbers 1 , 2 , 4 of the communication-state estimation data 142 shown in FIG.
  • the communication B is selected, and “B” is stored in the “ communication speed” field 1428 .
  • the communication speed of the communication A is higher than that of the communication B in the row number 3 , the communication A is selected, and “A” is stored in the “communication speed” field 1428 .
  • the above-described selection processing of selecting a wireless communication method may also be provided with processing of judging whether or not a connection can be made for a mesh code of the current position.
  • the above-described selection processing of selecting a wireless communication method may also be provided with processing of judging whether or not a connection can be made for a mesh code of the certain position. In addition, it is not necessary to perform calculation covering the whole move path from the current position to the destination.
  • a wireless communication method may also be selected within a range of specified distance from the current position in the move path (for example, within a range of 10 km), or within a range of the specified moving time from the current position along the move path (for example, within a range of 30 minutes), or within a range of the specified number of mesh codes from the current position in the move path (for example, within a range of five).
  • a wireless communication method can be selected.
  • the communication control unit 111 selects a wireless communication method that complies with a policy set by a user, as described with reference to FIG. 4 (S 640 ) For example, if the user sets the policy which lays stress on fees, the communication A is selected over a mesh code range from the row number 1 to the row number 4 shown in FIG. 3 . In a mesh code range of the row numbers 1 , 3 , 4 , a communication method in which a data transmission rate of 3 Mbps is set for the wireless communication device A is selected. In a mesh code range of the row number 2 , a communication method in which a data transmission rate of 1 Mbps is set for the wireless communication device A is selected.
  • a communication method in which a data transmission rate of 3 Mbps is set for the wireless communication device A is selected.
  • a communication method in which a data transmission rate of 1 Mbps is set for the wireless communication device A is selected.
  • a communication method of the wireless communication device B (a data transmission rate is 75 Mbps, which is a fixed value) is selected.
  • FIG. 7 is a flowchart illustrating processing of the communication method setting unit 113 .
  • the communication method setting unit 113 changes settings of a wireless communication unit, if the execution of the communication method setting unit 113 is started while the wireless communication unit executes regular communication processing, the regular communication processing will result in an error. For this reason, exclusive control is required between processing of the communication method setting unit 113 and the regular communication processing.
  • exclusive control is required between processing of the communication method setting unit 113 and the regular communication processing.
  • S 700 exclusive control
  • S 705 , S 735 how to control the processing flag (S 705 , S 735 ) are the same as the methods described in the steps S 500 , S 505 , S 550 shown in FIG. 5 . Therefore, a description of the exclusive control will be omitted here.
  • the current time is acquired (S 710 ).
  • a check is made as to whether or not a communication method corresponding to the communication-state estimation data 142 whose traveling estimated time 1422 is the newest but is older than the acquired current time has already been set in a wireless communication device (S 715 ). If it is judged that the communication method described above has already been set in the wireless communication device, the process proceeds to a step S 730 . If it is judged that the communication method described above has not been set in the wireless communication device, an estimated traveling route (mesh code) is acquired (S 720 ). Although a detailed description will be omitted, a reason why an estimated traveling route (mesh code) is acquired is to check whether or not the mobile object is currently traveling through the estimated traveling route (mesh code) acquired here.
  • Various kinds of parameters are set in the wireless communication device according to a communication method corresponding to an estimated traveling route (mesh code) (corresponding to the communication-state estimation data 142 determined with reference to the current time) (S 725 ). If the number of wireless communication devices is one, settings of various kinds of parameters in a control register, or the like, make it possible to operate the wireless communication device according to the selected communication method.
  • the parameters (control information) to be set in the control register, or the like include not only a data transmission rate of the wireless communication device, but also: the number of times retransmission is performed, which is used by a lower level protocol (the data link layer, the network layer, or the like); classification of an error correction code used for the bit error detection and correction; and the timeout time used when waiting for a response.
  • a wireless communication device capable of selecting a modulation method or a wireless communication device capable of selecting a carrier frequency. Accordingly, selection information used for the selection is also handled as a parameter. If the number of wireless communication devices is two or more, one must be selected from the plurality of wireless communication devices. As one of easy methods, information about a selected wireless communication device is stored in the storage unit 140 ; and when regular communication processing is executed, the selected wireless communication device is used with reference to this information.
  • a timer is set at a value of the estimated time 1422 that is after the current time, and that is the closest to the current time (S 730 ).
  • the value is selected from among pieces of estimated time data, each of which corresponds to each row number of the communication-state estimation data 142 shown in FIG. 3 .
  • This timer causes the communication method setting unit to start again at the set time.
  • a communication method corresponding to a current position of the mobile object is selected by use of actually measured data of a communication state corresponding to a position of the mobile object. This makes it possible to ensure a quick and proper response to a change in wireless communication environment. Other advantages of this embodiment will be understood from the above description.

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